Question

Hello I need help with the following I'm having trouble getting to just the main code. Attached is the ButtonDebounce header file and the description of the code the language is C++;

This lab will end with a functioning combination lock. The lock will have a combination that resides in EEPROM, and is programmable via the serial port. The user will enter a code, using the button and encoder on the board, and is shown on the lcd screen. Once the code and combination match the program will go to the Unlocked mode and start flashing the LED. A long press of the button will engage the lock again. Throughout this discussion it is assumed that there will be three integer arrays, each with 4 elements, declared as globals. One named Combination is the combination for our lock. Another will be called Code and is the code the user enters to try and unlock the lock. Finally an array named SerialInput, which is used to buffer data from the serial port, which will be transferred to Combination, once a four valid number are received

we will produce code that will read data in from the serial port and collect the input into SerialInput, and once we have 4 digits we will copy them over to the combination and write them to EEPROM. Then each time the system is reset (setup is run), we will want to read Combination from EEPROM and print it to the serial port. The code for this should go in loop and the pseudo code for this is included here:

If serial data is available

Read in current character

If character is a digit, greater than or equal to ‘0’ and less than or equal to ‘9’

Convert to a number and place in SerialInput

If four digits have come in Copy SerialInput to Combination

and write to EEPROM

end

else // not a digit

reset buffer to wait for four new digits end end

Similarly in setup code should be added

Read four integers from the EEPROM placing them in Combination.

if any of the numbers in Combination are not > 0 and < 9

Reset Combination to a simple default, such as 1,2,3,4

And write to EEPROM

ButtonDebounce Header File:

#ifndef ButtonDebounce_h
#define ButtonDebounce_h

#include "Arduino.h"

enum ButtonState{ButtonIdle, ButtonWait, ButtonHigh} state;

unsigned long ButtonTime;

int ButtonInitialize() {
pinMode(4, INPUT);
pinMode(13, OUTPUT);

}

int ButtonNextState(int Input) {
switch (state) {
case ButtonIdle:
if (Input == LOW) {
ButtonTime = millis();
state = ButtonWait;
digitalWrite(13, HIGH);
}
break;
case ButtonWait:
if (Input == HIGH) {
state = ButtonIdle;
}
else if (millis() - ButtonTime >= 5) {
state = ButtonHigh;
digitalWrite(13, LOW);
return 1;
}
break;
case ButtonHigh:
if (Input == HIGH) {
state = ButtonIdle;
return 2;
}
break;
}
return 0;
}

#endif

Answer 1

#ifndef ButtonDebounce_h
#define ButtonDebounce_h

#include "Arduino.h"

enum ButtonState{ButtonIdle, ButtonWait, ButtonHigh} state;

unsigned long ButtonTime;

void setup() {

int ButtonInitialize() {
pinMode(4, INPUT);
pinMode(13, OUTPUT);

}}

void loop ()

{

int ButtonNextState(int Input) {
switch (state) {
case ButtonIdle:
if (Input == LOW) {
ButtonTime = millis();
state = ButtonWait;
digitalWrite(13, HIGH);
}
break;
case ButtonWait:
if (Input == HIGH) {
state = ButtonIdle;
}
else if (millis() - ButtonTime >= 5) {
state = ButtonHigh;
digitalWrite(13, LOW);
return 1;
}
break;
case ButtonHigh:
if (Input == HIGH) {
state = ButtonIdle;
return 2;
}
break;
}
return 0;
}

#endif

}